Having military bases in Europe (if that's what you're referring to) is mutually beneficial to the the U.S and Europe but I wouldn't call it a subsidy. It's done primarily to preserve America's global sphere of influence.

The economic stimulus ended in the 50's, the cold war 30yrs ago.

You can have free healthcare as well as Pax Americana. If anything I believe that free healthcare (and a better education system) would keep Pax Americana around a lot longer.